Growth on my El Nino Ferns

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Hi, I was hoping I could get some help identifying and treating a growth that is showing up on my El Nino Ferms. I ...

Hi, I was hoping I could get some help identifying and treating a growth that is showing up on my El Nino Ferms. I can't get a picture because I havn't let them get large enough to get a clear shot.

The growth starts as a small green nodule towards the tip of the leaves. The nodule grows to about 1cm and then thin black tendrils drop out from it.

It only seems to grow on the ferns, and seems to be leaving the amazon swords that are planted around them alone. So far I've just been trimming the leaves and cutting off the tips with the growths on them, but they keep coming back.

I am guessing what you have is actually a Java Fern and if I am not mistaken those are baby plants, the black things you are talking about are the roots. If you could post a pic I could be more sure.
Heres is a picture of a Java Fern: